Tim Gunn says he expects “hell to freeze over” if he runs into Anna Wintour this week. The fashion expert writes in his new book that he saw Wintour being carried by bodyguards down the stairs after a 2006 fashion show. Gunn, promoting his book, “Gunn’s Golden Rules,” said Wintour went “ballistic” at his comments. He told us after the “Project Runway” show, “I wasn’t slinging mud or criticizing her character. More than 30 people must have seen it. I’m just the only one brave enough to tell the truth. Lord knows hell would freeze over if I came face to face with her here, but I probably wouldn’t be able to see past her handlers.”